TSX retreats on slide in resource stocks

By Fergal Smith TORONTO (Reuters) - Canada's main stock index closed lower on Friday, driven by weakness in resource shares after a plunge in China equities weighed on commodity prices. Trading was thin, with Wall Street closing early following Thursday's holiday. "It's commodities again, generally, that are hurting the Toronto market and they will continue to do so until their prices bottom," said Norman Levine, managing director at Portfolio Management Corp. The energy sector fell 1.4 percent,